Gainward TI4200 128MB GS Overclock!?

Hello~
I was just wondering if anyone has a 128mb GS ti4200 or ti4600 gainward video card and what speeds you got it to.
I can't seem to run my Gainward ti4200 128MB golden sample card (w/4ns RAM) to run at any speeds over than that of "safe mode," settings in the gainward software. When I try running it in any other mode or settings it freezes and I have to restart. I still have stock cooling on the card and am wondering how far that should take me.
I am running this card with Corsair XMS pc3500 512MB RAM and an XP 1600. Any help will be greatly appreciated... thanks!

If a Golden Sample card can't run at the "enhanced mode" settings (IIRC, 260 GPU, 520 memory) using the stock cooling, it is defective and you can RMA it.